package com.hmdp.interceptor;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.util.StrUtil;
import com.hmdp.dto.UserDTO;
import com.hmdp.utils.RedisConstants;
import com.hmdp.utils.UserHolder;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.Map;
import java.util.concurrent.TimeUnit;

public class RefreshTokenInterceptor implements HandlerInterceptor {
    private StringRedisTemplate stringRedisTemplate;

    public RefreshTokenInterceptor(StringRedisTemplate stringRedisTemplate){
        this.stringRedisTemplate = stringRedisTemplate;
    }

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
//        //1.获取session
//        HttpSession session = request.getSession();
//        //2.获取session中的用户
//        Object user = session.getAttribute("user");
//        //3.判断用户是否存在
//        if(user==null){
//            response.setStatus(401);
//            return false;
//        }
//        //5.存在，保存用户信息到thread local
//        UserHolder.saveUser((UserDTO) user);

        //1.获取请求头中的token
        String token = request.getHeader("authorization");
        if(StrUtil.isBlankIfStr(token)){
            return true;
        }
        //2.基于token去redis中获取用户
        Map<Object, Object> map = stringRedisTemplate.opsForHash().entries(RedisConstants.LOGIN_USER_KEY + token);
        //3.判断用户是否存在
        if(map.isEmpty()){
            return true;
        }
        //5.将查询到达hash数据转换为userdto对象
        UserDTO userDTO = BeanUtil.fillBeanWithMap(map, new UserDTO(), false);
        //6.存在，将用户信息保存到thread local
        UserHolder.saveUser(userDTO);
        //7.刷新token有效期
        stringRedisTemplate.expire(RedisConstants.LOGIN_USER_KEY + token,RedisConstants.LOGIN_USER_TTL, TimeUnit.SECONDS);
        //8.放行
        return true;
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        UserHolder.removeUser();
    }
}
